Re: [Xen-devel] [PATCH] common/gnttab: Introduce command line feature controls

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.08.17 at 16:50, <andrew.cooper3@xxxxxxxxxx> wrote:
> --- a/docs/misc/xen-command-line.markdown
> +++ b/docs/misc/xen-command-line.markdown
> @@ -868,6 +868,19 @@ Controls EPT related features.
>  
>  Specify which console gdbstub should use. See **console**.
>  
> +### gnttab
> +> `= List of [ max_ver:<integer>, transitive ]`
> +
> +> Default: `gnttab=max_ver:2,transitive`
> +
> +Control various aspects of the grant table behaviour available to guests.
> +
> +* `max_ver` Select the maximum grant table version to offer to guests.  Valid
> +version are 1 and 2.
> +* `transitive` Permit or disallow the use of transitive grants.  Note that 
> the
> +use of grant table v2 without transitive grants is an ABI breakage from the
> +guests point of view.

Btw, with the need to use v2 on huge systems I'm no longer
convinced providing an option to disable it is a good idea.

Jan


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